CN105099190A - Bidirectional DC/DC converter and control method thereof - Google Patents

Bidirectional DC/DC converter and control method thereof Download PDF

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Publication number
CN105099190A
CN105099190A CN201510465659.9A CN201510465659A CN105099190A CN 105099190 A CN105099190 A CN 105099190A CN 201510465659 A CN201510465659 A CN 201510465659A CN 105099190 A CN105099190 A CN 105099190A
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switching tube
output end
electric energy
energy output
way
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CN201510465659.9A
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Chinese (zh)
Inventor
江涛
余勇
张长信
曹伟
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Priority to CN201510465659.9A priority Critical patent/CN105099190A/en
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Abstract

The invention discloses a bidirectional DC/DC converter and a control method thereof. A main circuit topology of the bidirectional DC/DC converter comprises two filtering capacitors, a filtering inductor and four switch tubes with anti-paralleled diodes. The control method comprises that one bridge of the main circuit topology is controlled in the fixed duty ratio, and the other bridge is controlled in a PWM control strategy, so that the main circuit topology of the bidirectional DC/DC converter is avoided from limitation of the high and low voltages at the two ends.

Description

A kind of two-way DC/DC converter and control method thereof
Technical field
The present invention relates to electric and electronic technical field, more particularly, relate to a kind of two-way DC/DC converter and control method thereof.
Background technology
Shown in Fig. 1, two-way DC/DC inverter main circuit topology is made up of the switching tube S1 ~ S2 of filter capacitor C1 ~ C2, filter inductance L and band anti-paralleled diode, the electric energy output end of S1 connects the electrical energy inputs of S2, C1 is connected between the electrical energy inputs of S1 and the electric energy output end of S2, is connected between the electric energy output end of S1 and the electric energy output end of S2 after C2 and L serial connection.
Definition C1, C2 both end voltage is respectively V 1and V 2, then at power by V 1flow to V 2time, must be decompression mode; At power by V 2flow to V 1time, must be boost mode, namely under PWM controls, this topological both end voltage necessarily also exists such relation: V 1> V 2.This just makes this topology there is limitation in the configuration of both end voltage height.
Summary of the invention
In view of this, the invention provides a kind of two-way DC/DC converter and control method thereof, to avoid the limitation of two-way DC/DC inverter main circuit topology in the configuration of both end voltage height.
A kind of control method of two-way DC/DC converter, wherein, described two-way DC/DC inverter main circuit topology comprises 2 filter capacitors, the switching tube of 1 filter inductance and 4 band anti-paralleled diodes, each element annexation is: the electric energy output end of first switching tube connects the electrical energy inputs of second switching tube, the electric energy output end of the 3rd switching tube connects the electrical energy inputs of the 4th switching tube, the electric energy output end of second switching tube connects the electric energy output end of the 4th switching tube, filter inductance is connected between the electric energy output end of first switching tube and the electric energy output end of the 3rd switching tube, first filter capacitor is connected between the electrical energy inputs of first switching tube and the electric energy output end of second switching tube, second filter capacitor is connected between the electrical energy inputs of the 3rd switching tube and the electric energy output end of the 4th switching tube,
Described control method, comprising: adopt fixed duty cycle control, another brachium pontis employing PWM control strategy to a brachium pontis in described two-way DC/DC inverter main circuit topology.
Wherein, when the difference of described two-way DC/DC inverter main circuit topology both end voltage does not exceed preset range, setting described fixed duty cycle is arbitrary value under PWM control strategy in acceptable modulation range.
Wherein, when the difference of described two-way DC/DC inverter main circuit topology both end voltage exceeds preset range, setting described fixed duty cycle is arbitrary value in 0 ~ 1 scope.
Wherein, setting described fixed duty cycle is 1.
A kind of two-way DC/DC translation circuit, the control unit comprising main circuit and be connected with described main circuit, described main circuit comprises 2 filter capacitors, the switching tube of 1 filter inductance and 4 band anti-paralleled diodes, wherein: the electric energy output end of first switching tube connects the electrical energy inputs of second switching tube, the electric energy output end of the 3rd switching tube connects the electrical energy inputs of the 4th switching tube, the electric energy output end of second switching tube connects the electric energy output end of the 4th switching tube, filter inductance is connected between the electric energy output end of first switching tube and the electric energy output end of the 3rd switching tube, first filter capacitor is connected between the electrical energy inputs of first switching tube and the electric energy output end of second switching tube, second filter capacitor is connected between the electrical energy inputs of the 3rd switching tube and the electric energy output end of the 4th switching tube,
Described control unit, comprising: for the first control unit adopting fixed duty cycle to control to the brachium pontis of in described main circuit, and another brachium pontis in described main circuit is adopted to the second control unit of PWM control strategy.
Wherein, when the difference of described main circuit both end voltage does not exceed preset range, it is arbitrary value under PWM control strategy in acceptable modulation range that described control unit sets described fixed duty cycle.
Wherein, when the difference of described main circuit both end voltage exceeds preset range, it is arbitrary value in 0 ~ 1 scope that described control unit sets described fixed duty cycle.
Wherein, described control unit sets described fixed duty cycle is 1.
Wherein, the switching tube of described 4 band anti-paralleled diodes is: the IGBT of 4 band anti-paralleled diodes, or the MOSFET of 4 band anti-paralleled diodes.
As can be seen from above-mentioned technical scheme, by adopting the brachium pontis had in the two-way DC/DC inverter main circuit topology of doube bridge arm, fixed duty cycle controls, another brachium pontis adopts PWM control strategy in the present invention, the transformation ratio of this topology can be adjusted arbitrarily by power flow direction as required, thus avoid the limitation of two-way DC/DC inverter main circuit topology in the configuration of both end voltage height.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of two-way DC/DC inverter main circuit topological structure schematic diagram disclosed in prior art;
Fig. 2 is a kind of two-way DC/DC inverter main circuit topological structure schematic diagram disclosed in the embodiment of the present invention;
Fig. 3 is the equivalent topologies structural representation of described two-way DC/DC inverter main circuit topology;
Fig. 4 a is at V 1> V 2each switching tube drive waveforms schematic diagram corresponding to voltage configuration;
Fig. 4 b is at V 1<V 2each switching tube drive waveforms schematic diagram corresponding to voltage configuration;
Fig. 5 is a kind of two-way DC/DC transformer configuration schematic diagram disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For avoiding the limitation of two-way DC/DC inverter main circuit topology in the configuration of both end voltage height, the embodiment of the invention discloses a kind of control method being applied to two-way DC/DC converter shown in Fig. 2.
Shown in Fig. 2, two-way DC/DC inverter main circuit topology comprises 2 filter capacitor C 1~ C 2, 1 filter inductance L and 4 band anti-paralleled diode switching tube S 1~ S 4, each element annexation is: switching tube S 1electric energy output end meet switching tube S 2electrical energy inputs; Switching tube S 3electric energy output end meet switching tube S 4electrical energy inputs; Switching tube S 2electric energy output end meet switching tube S 4electric energy output end; Filter inductance L is connected on switching tube S 1electric energy output end and switching tube S 3electric energy output end between; Filter capacitor C 1be connected on switching tube S 1electrical energy inputs and switching tube S 2electric energy output end between; Filter capacitor C 2be connected on switching tube S 3electrical energy inputs and switching tube S 4electric energy output end between.
Wherein, the switching tube S of described 4 band anti-paralleled diodes 1~ S 4can be the IGBT (InsulatedGateBipolarTransistor of 4 band anti-paralleled diodes, igbt), also can be the MOSFET (MetalOxideSemiconductorFET, mos field effect transistor) of 4 band anti-paralleled diodes.With switching tube S 1for example, as switching tube S 1during for IGBT, switching tube S 1electrical energy inputs be the collector electrode of IGBT, switching tube S 1electric energy output end be the emitter of IGBT; As switching tube S 1during for MOSFET, switching tube S 1electrical energy inputs be the drain electrode of MOSFET, switching tube S 1electric energy output end be the source electrode of MOSFET.Fig. 2 is only with switching tube S 1~ S 4unified employing IGBT exemplarily.
As can be seen from above-mentioned annexation, topology shown in Fig. 2 has doube bridge arm, is by upper and lower two the switching tube S of same brachium pontis respectively 1and S 2composition brachium pontis 1 and by upper and lower two the switching tube S of same brachium pontis 3and S 4the brachium pontis 2 of composition.For topology shown in Fig. 2, disclosed in the present embodiment, control method comprises: adopt fixed duty cycle control, another brachium pontis employing PWM control strategy to a brachium pontis.
In order to clearer description the technical program, below on the basis going deep into topology shown in explosion views 2, the control method disclosed in the present embodiment is described in detail.
Filter inductance L in topology shown in Fig. 2 is equivalent to two filter inductance L 1, L 2series connection, then between filter inductance L1 and filter inductance L2, increase by two filter capacitor C 3and C 4, as shown in Figure 3.Due to the filter capacitor C newly increased 3and C 4be only a secondary filtering effect, primary circuit can not be disturbed to export, therefore Fig. 2 and Fig. 3 equivalent topologies each other.
In figure 3, filter capacitor C 1and C 3, brachium pontis about 1 two switching tube S 1and S 2and filter inductance L 1together constitute a two-way DC/DC converter identical with topological structure shown in Fig. 1; Filter capacitor C 2and C 4, brachium pontis about 2 two switching tube S 3and S 4and filter inductance L 2constitute a two-way DC/DC converter identical with topological structure shown in Fig. 1 too, topology can be essentially the combination of topology shown in 2 Fig. 1 as shown in Figure 3.Power is by V 1flow to V 3for step-down (V 3common port voltage for topology shown in these 2 Fig. 1), power is by V 3flow to V 2for boosting, that is, topology shown in Fig. 3 is equivalent to a Buck circuit and a Boost circuit cascade.
On definition Fig. 3 bridge arm 1, on pipe S1 and brachium pontis 2, the duty ratio of pipe S3 is respectively D 1and D 2, switch periods is T, then ignoring in the situation of dead band, and the duty ratio of brachium pontis 1 time pipe S1 and brachium pontis 2 times pipe S3 is respectively (1-D 1) * T and (1-D 2) * T.Because topology shown in Fig. 3 is equivalent to a Buck circuit and a Boost circuit cascade, the common port voltage V of so described Buck circuit and described Boost circuit 3=V 1* D1=V2*D2.Analyze known: work as D 1during for fixed value, by regulating D 2size can to change described in Fig. 3 the transformation ratio of topology, at V 1> V 2voltage configuration under need to arrange D 1< D 2(corresponding each switching tube drive waveforms as shown in fig. 4 a), at V 1<V 2voltage configuration under need to arrange D 1> D 2(corresponding each switching tube drive waveforms as shown in Figure 4 b); In like manner, D is worked as 2during for fixed value, by regulating D 1size, equally can change the transformation ratio of topology shown in Fig. 3, meet topological both end voltage configuration needs.
As can be seen here, by adopting a brachium pontis in (i.e. topology shown in Fig. 2) shown in Fig. 3, fixed duty cycle controls the present embodiment, another brachium pontis adopts PWM control strategy, the transformation ratio of this topology can be adjusted arbitrarily by power flow direction as required, thus avoid the limitation of two-way DC/DC inverter main circuit topology in the configuration of both end voltage height.
If consider, on a brachium pontis, pipe fixed duty cycle is 1 or closely 1, then at V 1with V 2time closely, on another brachium pontis, pipe duty ratio can only adjust near 1, can there is the problem that modulation degree is inadequate; Same, if on a brachium pontis, pipe fixed duty cycle is 0 or closely 0, then at V 1with V 2time closely, on another brachium pontis, pipe duty ratio can only adjust near 0, can there is the inadequate problem of modulation degree equally.Therefore, at V 1with V 2(by judging V under occasion closely 1with V 2difference whether exceed preset range to determine, be specially, with V 1with V 2difference do not exceed described preset range as V 1with V 2judgment basis closely, with V 1with V 2difference exceed described preset range as V 1with V 2differ larger judgment basis), described fixed duty cycle must be set in conjunction with the minimum turn-on and turn-off time of switching tube, that is, under now described fixed duty cycle must being set in PWM control strategy in acceptable modulation range, such as, D is set 1adjustable, simultaneously by fixed duty cycle D 2be set to 10% ~ 90% (when switching frequency is low, this scope can also appropriateness relax) in certain value.Visible, the present embodiment can both end voltage topological shown in Fig. 2 closely time very reliable and effective control mode is provided.
And at V 1with V 2under differing larger occasion, owing to there is not the inadequate problem of modulation degree, therefore described fixed duty cycle can be set to the arbitrary value (comprising 0 and 1) in 0 ~ 1.Certainly, at V 1with V 2when differing larger, be reduce switching loss, pipe duty ratio on adjustable for pipe duty ratio on a brachium pontis, another brachium pontis can be fixed as 1 (namely brachium pontis does PWM control, another brachium pontis is set as normal open state) as preferred control program.
In addition, see Fig. 5, the embodiment of the invention also discloses a kind of two-way DC/DC translation circuit, the control unit 200 comprising main circuit 100 and be connected with main circuit 100;
Main circuit 100 comprises: 2 filter capacitors, the switching tube of 1 filter inductance and 4 band anti-paralleled diodes, wherein, the electric energy output end of first switching tube connects the electrical energy inputs of second switching tube, the electric energy output end of the 3rd switching tube connects the electrical energy inputs of the 4th switching tube, the electric energy output end of second switching tube connects the electric energy output end of the 4th switching tube, filter inductance is connected between the electric energy output end of first switching tube and the electric energy output end of the 3rd switching tube, first filter capacitor is connected between the electrical energy inputs of first switching tube and the electric energy output end of second switching tube, second filter capacitor is connected between the electrical energy inputs of the 3rd switching tube and the electric energy output end of the 4th switching tube,
Control unit 200 comprises: for the first control unit 201 adopting fixed duty cycle to control to the brachium pontis of in main circuit 100, and another brachium pontis in main circuit 100 is adopted to the second control unit 202 of PWM control strategy.
Wherein, when the difference of main circuit 100 both end voltage does not exceed preset range, it is arbitrary value under PWM control strategy in acceptable modulation range that control unit 200 sets described fixed duty cycle.
Wherein, when the difference of main circuit 100 both end voltage exceeds preset range, it is arbitrary value in 0 ~ 1 scope that control unit 200 sets described fixed duty cycle.
Wherein, control unit 200 sets described fixed duty cycle is 1.
Wherein, the switching tube of described 4 band anti-paralleled diodes is: the IGBT of 4 band anti-paralleled diodes, or the MOSFET of 4 band anti-paralleled diodes.
In sum, by adopting the brachium pontis had in the two-way DC/DC inverter main circuit topology of doube bridge arm, fixed duty cycle controls, another brachium pontis adopts PWM control strategy in the present invention, the transformation ratio of this topology can be adjusted arbitrarily by power flow direction as required, thus avoid the limitation of two-way DC/DC inverter main circuit topology in the configuration of both end voltage height.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For DC/DC translation circuit two-way disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the embodiment of the present invention, can realize in other embodiments.Therefore, the embodiment of the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (9)

1. the control method of a two-way DC/DC converter, it is characterized in that, described two-way DC/DC inverter main circuit topology comprises 2 filter capacitors, the switching tube of 1 filter inductance and 4 band anti-paralleled diodes, wherein: the electric energy output end of first switching tube connects the electrical energy inputs of second switching tube, the electric energy output end of the 3rd switching tube connects the electrical energy inputs of the 4th switching tube, the electric energy output end of second switching tube connects the electric energy output end of the 4th switching tube, filter inductance is connected between the electric energy output end of first switching tube and the electric energy output end of the 3rd switching tube, first filter capacitor is connected between the electrical energy inputs of first switching tube and the electric energy output end of second switching tube, second filter capacitor is connected between the electrical energy inputs of the 3rd switching tube and the electric energy output end of the 4th switching tube,
Described control method, comprising: adopt fixed duty cycle control, another brachium pontis employing PWM control strategy to a brachium pontis in described two-way DC/DC inverter main circuit topology.
2. the control method of two-way DC/DC converter according to claim 1, it is characterized in that, when the difference of described two-way DC/DC inverter main circuit topology both end voltage does not exceed preset range, setting described fixed duty cycle is arbitrary value under PWM control strategy in acceptable modulation range.
3. the control method of two-way DC/DC converter according to claim 1, is characterized in that, when the difference of described two-way DC/DC inverter main circuit topology both end voltage exceeds preset range, setting described fixed duty cycle is arbitrary value in 0 ~ 1 scope.
4. the control method of two-way DC/DC converter according to claim 3, is characterized in that, setting described fixed duty cycle is 1.
5. a two-way DC/DC translation circuit, the control unit comprising main circuit and be connected with described main circuit, is characterized in that,
Described main circuit comprises 2 filter capacitors, the switching tube of 1 filter inductance and 4 band anti-paralleled diodes, wherein: the electric energy output end of first switching tube connects the electrical energy inputs of second switching tube, the electric energy output end of the 3rd switching tube connects the electrical energy inputs of the 4th switching tube, the electric energy output end of second switching tube connects the electric energy output end of the 4th switching tube, filter inductance is connected between the electric energy output end of first switching tube and the electric energy output end of the 3rd switching tube, first filter capacitor is connected between the electrical energy inputs of first switching tube and the electric energy output end of second switching tube, second filter capacitor is connected between the electrical energy inputs of the 3rd switching tube and the electric energy output end of the 4th switching tube,
Described control unit, comprising: for the first control unit adopting fixed duty cycle to control to the brachium pontis of in described main circuit, and another brachium pontis in described main circuit is adopted to the second control unit of PWM control strategy.
6. two-way DC/DC converter according to claim 5, it is characterized in that, when the difference of described main circuit both end voltage does not exceed preset range, it is arbitrary value under PWM control strategy in acceptable modulation range that described control unit sets described fixed duty cycle.
7. two-way DC/DC converter according to claim 5, is characterized in that, when the difference of described main circuit both end voltage exceeds preset range, it is arbitrary value in 0 ~ 1 scope that described control unit sets described fixed duty cycle.
8. two-way DC/DC converter according to claim 7, is characterized in that, it is 1 that described control unit sets described fixed duty cycle.
9. the two-way DC/DC converter according to any one of claim 5 ~ 8, is characterized in that, the switching tube of described 4 band anti-paralleled diodes is: the IGBT of 4 band anti-paralleled diodes, or the MOSFET of 4 band anti-paralleled diodes.
CN201510465659.9A 2015-07-29 2015-07-29 Bidirectional DC/DC converter and control method thereof Pending CN105099190A (en)

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CN105576970A (en) * 2016-03-02 2016-05-11 阳光电源股份有限公司 Bidirectional DC/DC converter and control method thereof
CN109217417A (en) * 2018-09-17 2019-01-15 阳光电源股份有限公司 Battery equalisation system and distributed generation system
CN111244992A (en) * 2020-01-20 2020-06-05 广州智光电气技术有限公司 Hybrid energy storage unit, cascade type converter system and charge-discharge control method thereof

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CN111244992A (en) * 2020-01-20 2020-06-05 广州智光电气技术有限公司 Hybrid energy storage unit, cascade type converter system and charge-discharge control method thereof

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